Chain pipe-wrench.



G. AMBORN.

CHAIN PIPE WRENCH.

APPLICATION FILED FEB. I9, 1914.

Patented July 13,1915.

2 SHEETS-SHEET i- INVENTOR WITNESSES: 22% Z By Attorneys,

APH 120., WASHINGTON D c B D E M P m PatentedJuly 13, 1915.

2 SHEETS-SHEET 2 INVENTOR By Attorneys,

WITNESSES: fit;

GEORGE AM IBOBN, F CHAPINVIIJLE, CONNECTICUT, ASSIGNOR TO J. H. WILLIAMS8:

00., OF BROOKLYN, NEW YORK, A; CORPORATION OF NEW YORK.

CHAIN PIPE-WRENCH.

Patented July 13, 1915.

Application filed February 19, 1914. Serial No. 819,658.

To all whom it may concern:

Be it known that I, GEORGE AMBORN, a citizen of the United States ofAmerica, residing in Chapinville, in the county of Litchfield and Stateof Connecticut, have invented certain new and useful Improvements inChain Piped Wrenches, of which the following is a specification.

The present invention aims to provide certain improvements in chain pipewrenches, especially wrenches of the doubleaw type shown in my priorpatents, Nos. 876,927 of January 21, 1908, and 952,860 of March 22,1910.

The invention aims especially to provide a wrench which is simple inconstruction, and in which the portion of the handle be tween the jawscan be wider and the swinging link and central stud or pin stronger thanin previous wrenches, and in whichthe chain secures a more perfect gripupon plpes of the smaller sizes.

The accompanying drawings illustrate embodiments of the invention.

Figure 1 is a longitudinal vertical section between the two jaws,showing the chain in elevation. Fig. 2 is a plan of the same, showingonly the portion of the chain which is adjacent the lock. Fig. 3 is asection on the line 3-3 of Fig. 2. Fig. 4 is a side elevation of thehandle. Fig. 5 is an inside face elevation of one of the jaws. Figs. 6to 9 inclusive illustrate a slightly modified form of constructionembodying the invention. Fig. 6 is a side elevation of the handle, andFig. 7 a plan view of the same. Fig. 8 is an inside face elevation ofone of the jaws. Fig. 9 is a central transverse section of the assembledwrench.

Referring to the embodiments of the invention illustrated, each of thejaws A is of the usual double-ended type having at each end a set oftoothed faces B B. Each jaw has also a central bore C for the centralpin D which carries the swinging link E constituting the fixed end ofthe chain, and has in its opposite end portions bores F F to receive afastening bolt Gr. When the working faces B are to be used the handle isfastened by means of the central pin D passing through the central boreof each of the jaws and by means of the bolt Cr passing through the boreF in the rear end of each of the jaws. The handle H projects forward toa polnt beyond the central pin, as

, indicated and the upper end of the chain is lockedas hereinafterdescribed. The locked end of the chain lies between the upper edges ofthe jaws, and where a cable chain is used a link lying in anapproximately vertical plane comes just over the ends of the prongs Jand J of the handle. Such a link is indicated at N in Fig. 1. This linkswings down into the space between the prongs J J and below the plane ofthe next link 0 which is supported on the top of the handle, so that thelink N can extend in a substantially straight line toward the pipe, andthus cause the chain to engage the maximum portion of the circumferenceof the pipes even where they are of comparatively small diameter.

In some constructions the end bolts G are omitted, and the onlyfastening between. the jaws is through a central bolt D. Whether asingle bolt or two bolts have been used for this purpose, it has beencustomary to provide horizontal ledges on the inner faces of the aws(either integral with the aws as in my patents above mentioned orfastened on the jaws as in patent to Dickson No. 1,055,14t8 of March 4,1913) engaging the top and bottom faces of the handle, so as to preventangular movement of the jaws relatively to the handle. As the totalwidth between thetop and bottom edges of the jaws is limited, so thewidth of the handle from its top to its bottom face has been furtherlimited by the necessity of fitting it between such ribs. Consequentlythe central pin and the swinging link have been restricted in size, andwith the portion of the handle surrounding the central pin have beenfound unduly weak compared with the other parts of the wrench. In anapplication pending concurrently herewith I have described aconstruction which avoids this difficulty by removing the ledges fromthe inner faces of the jaws and using as'a substitute the horizontalfaces of locks which are formed integrally with the jaws and projectinward from the inner faces thereof. In the present application Ipropose to secure the desired extra width of the handle from top tobottom by making the looks upon the top and bot-tom faces of the handleand integral therewith, and by extending such top and bottom faces ofthe handle beyond-the inter-engaging projections which are provided forpreventing the angular movement of the jaws referred to. For eX- ample,the top and bottom faces of the handle may be provided with pairs oflocks P backwardly curved and shaped to engage ,the forward portion of aflat link Q of a cable chain, the next link R lying between the lugs Pand between the prongs J and J while the third link 0 rests on the topface of the handle between the jaws.

The side faces of the handle and the inner faces of the jaws areprovided with interengaging projections and recesses lying within thespace between the planes of the top and bottom faces of the handle, andthe full width of the top and bottom faces of the handle is arranged todirectly support the link 0 and adjacent parts of the chain. T heinter-engaging projections and recesses referred to may be of variousstyles. In Figs. 1 to 5 l have shown the jaws A provided withlongitudinal recesses R into which fit similar projecting ribs S on theside faces of the handle. In Figs. 6 to 9 I have shown the faces of thejaws formed with a central recess T adapted to be engaged by a boss U onthe handle, and end recesses V V, one or the other of which will beengaged by a boss W on the handle. By making the projections on thehandle the strength of this member is increased as compared with ahandle having recessed sides or even plain fiat sides.

Although I have described with great particularity of detail certainspecific embodiments of my invention, yet it is not to be understoodtherefrom that the invention is restricted to the particular embodimentsdisclosed.

Various modifications thereof in detail and in the arrangement of theparts may he made by those skilled in the art without departure from theinvention.

What I claim is l. A reversible jaw chain pipe wrench having a handle, apair of doubleen'ded reversible jaws, and a central pin carrying aswinging link forming the fast end of the chain, the side faces of thehandle and the inner faces of the jaws being formed with interengagingprojections and recesses to prevent angular movement of the jawsrelatively to the handle, top and bottom faces of the handle lyingbeyond the top and bottom of said projections and the entire width ofthe top and bottom faces of the handle being arranged to directlysupport the portion of the locked end of the chain which. lies betweenthe jaws, whereby the portion of the handle between the jaws is riade ofmaximum width from top to bottom.

2. A reversible jaw chain pipe wrench having a handle, a pair ofdouble-ended lBVcI'Slble jaws, and a central pin carrying a swing inglink forming the fast end of the chain, the top and bottom faces of thehandle being provided with locks, the side faces of the handle and theinner faces of the jaws be ing formed with inter-engaging projectionsand recesses to prevent angular movement of the jaws relatively to thehandle, said inter-engaging projections and recesses lying within thespace between the planes of the top and bottom faces of the handle, andthe entire width of the top and bottom faces of the handle beingarranged to directly support the portion of the locked end of the chainwhich lies between the aws, whereby the portion of the handle betweenthe jaws is made of maximum width from top to bottom.

3. A reversible jaw chain pipe wrench having a handle, a pair ofdouble-ended reversible jaws, and a central pin carrying a swin ing linkforming the fast end of the chain,

the side facesof the handle and the inner faces of the jaws being formedwith interengaging projections and recesses to prevent angular movementof the jaws relatively to the handle, the top and bottom faces of thehandle lying beyond the top and bottom faces of said projections.

4. A reversible jaw chain pipe wrench having a handle, a pair ofdouble-ended reversible jaws, and a central pin carrying a swinging linkforming the fast end of the chain, the side faces of the handle beingprovided with projections, and the inner faces of the jaws beingprovided with recesses adapted to be engaged by said projections toprevent angular movement of the jaws relatively to the handle, the topand bottom faces of the handle lying beyond the top and bot tom of saidprojections.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

GEQRGE AMBORN.

l Vitnesses CHAS. B. I-IAnnis, JOHN B. PAYNE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

